Any of the cartridges you mention would be fine. I use the .300 Wby mag. with a 180 gr AB Weatherby load for elk. I've not had one go more than a 100 yards yet with most taking only a few steps before tipping over. It has 800 foot pounds more energy at 300 yards than the 30-06 with a 180 gr with a MV of 2,820fps (Superformance). Important if that big bull happens to move slightly as you pull the trigger or you have a less than perfect angle. It's also flatter shooting and mine shoots sub MOA of a back pack. Using a gun like a Accumark the recoil is not bad at all due to the weight of the gun with scope. A good sling and a good back pack like an Eberlestock with built in scabbard makes hauling around a heavier rifle in elk country much easier.